Interesting article in Sept 2023 QST titled "Understanding the Boltzmann Constant" which looked at a receivers noise floor based on filter width. The two filterwidths that were compared were 500Hz vs 2400Hz. Long story short the 500Hz BW had a 7dB better noise floor than 2400Hz. So this article confirmed my reasoning to use a 600Hz filter (a little wider than the 500Hz VARA signal but helps compensate for the many stations who are 50-100Hz off freq).
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Well - thats a myth that is now officially proven :) Thanks Gary. Setting my rig now :)